With the wide application of xDSL broadband, xDSL modem is increasingly widely used. As statistics show, there are about 64,000,000 DSL subscribers worldwide at the beginning of 2009. It means that about 64,000,000 DLS modems are used. As a result, a large number of modems will return for repair annually. Among those returned modems, about 60% to 70% modems are intact according to detection. They do not need repair. DslModemBulkTest is an xDSL batch test system. It tests whether the modems are damaged in batch, and then rapidly find out the faulty modem. The main DslModemBulkTest functions includes the following: 1.Test whether the modems are damaged or not in batch 2.Upgrade modems in batch 3.Support the wireless modem test 4.Support longtime performance test on the modem